Eight kinds of sweet orange peels extracts were investigated to compare their antioxidant active ingredients and antioxidant capacity.The results showed that the highest level of the content of polyphenols,flavonoids,tannins and vitamin C were found in Mayang Bingtang sweet orange peel extracts,which reached 7.60 mg gallic acid equivalent(GAE)/per gram dried sample(g·m d),4.57 mg rutin equivalent(RE)/g·m d,17.90 tannin(TAE)mg/g·m d,17.86 mg vitamin c(VC)/g·m d,respectively.Meanwhile,Mayang Bingtang orange peel also showed the highest ferric...